Airplane rotations and turning
You are very close in your setup. you only need one more mouse look actuator.

The reason why you need another actuator is because you currently have nothing to make the airship rotate along the Y. Adding another mouse look actuator can fix that.

I have also changed the settings slightly from what you had, because I think it behaves better with these values.



The first mouse look actuator does the roll.



The second mouse look actuator does the pitch and yaw.



With both of them together, it behaves just like a flying fortress of total monkey awesomeness



With the actual mesh from the flying fortress only with BGE materials